changeset 981:19013451fcdd

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Make pyflakes avoid viff.libs package.
We don't care about warnings to third-party libraries, and because of
pyflakes bug 1499 we get spurious warnings like this:
viff/libs/configobj.py:40: redefinition of unused 'BOM_UTF8' from line 36
viff/libs/configobj.py:42: redefinition of unused 'BOM_UTF16_LE' from line 36
viff/libs/configobj.py:44: redefinition of unused 'BOM_UTF16_BE' from line 36
viff/libs/configobj.py:47: redefinition of unused 'BOM_UTF16' from line 36
The pyflakes bug report:
http://www.divmod.org/trac/ticket/1499